Tribological characteristics of high strength steel sheets under hot stamping conditions
Tribological characteristics of high strength steel sheets under hot stamping conditions
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DOI：
10.1016/j.jmatprotec.2011.05.009
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发表时间：
2011-11-01
影响因子：
6.3
通讯作者：
Borsetto, F.
中科院分区：
文献类型：
--
作者：
Ghiotti, A.;Bruschi, S.;Borsetto, F.
目前，高强度钢板的热冲压技术被用于生产具有高强度/重量比和高抗冲击性的汽车零部件。为了避免加热阶段的结垢和脱碳，在金属板材上涂上了专门开发的Al-Si涂层，这种涂层已经证明对金属板材在成形阶段的摩擦学行为也有相关的影响。本文从表面形貌、表面粗糙度和摩擦学特性三个方面对工业热冲压工艺中典型的工艺参数对板材涂层特性进行了基础性研究。结果表明，坯料加热促进了铁在Al-Si涂层中的扩散，形成了Al-Fe-Si三元合金，其特性取决于热循环参数，并证明了金属坯料表面摩擦系数的摩擦学特性取决于坯料温度和接触压力。(C)2011爱思唯尔B.V.保留所有权利。
Nowadays, the hot stamping of high strength steel sheets is currently utilized to produce automotive components characterized by a high strength-to-weight ratio and an increased resistance to impact. In order to avoid scaling and decarburization during the heating stage, the metal sheets are coated with a specially developed Al-Si coating that have proved a relevant influence also on the tribological behaviour of the metal sheets during the forming stages. The paper presents a fundamental study about the sheet coating characteristics in terms of morphology, surface roughness and tribological behaviour as a function of the process parameters typical of industrial hot stamping processes. The presented results show that the blank heating promotes the iron diffusion into the Al-Si coating giving form to an Al-Fe-Si ternary alloy whose characteristics depend on the thermal cycle parameters; moreover, it is proved that the tribological characteristics of the metal blank surface in terms of friction coefficient depend on the blank temperature and contact pressure. (C) 2011 Elsevier B.V. All rights reserved.